题目内容

Which one can not inhibit protein synthesis?

A. penicillins,
B. gentamicin,
C. tetracyclines
D. streptomycin.

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Which one is not the advantage of Semisynthetic antibioticscomparing to naturally occurring antibiotics?

A. more effective,
B. much cheaper;
C. longer lasting,
D. easier to administer

The key to successful chemotherapy against microbes is:______.

A. selective toxicity;
B. structure of an antibiotic;
C. Molecular size;
D. the spectrum of action

计算机网络根据覆盖范围和用户都有哪些类别?各种类别的网络都有哪些特点?

比较电路交换、报文交换和分组交换的主要优缺点。

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